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- W2001055679 abstract "Abstract Modern Pulsed-Neutron Spectrometry (PNS) well logging tools produce measurements (e.g., Carbon/Oxygen (C/O) ratio, lithology (Ca/Si) ratio, elemental yields, etc) that are impacted by internal as well as external factors. The external ones are well known: porosity, lithology, borehole size, casing size, cement thickness, borehole fluid type, centering, tubing size, to name a few. These factors have been discussed extensively in the literature and will not be addressed here. Internal effects have not, however, been extensively discussed in the literature. They arise from unit-to-unit variations in component characteristics. Some examples are scintillator and photomultiplier performance, dead-time and pulse pileup effects, electronic, and analog-to-digital converter linearity. All of these will be discussed here. These internal effects generally lead to differences, from unit-to-unit, in the absolute magnitude of output quantities measured (C/O ratio, lithology ratio, for example). Fortunately, the log character (i.e. the variations with depth) is usually preserved. Unit-to-unit variability is of concern in well monitoring projects because of the likelihood that logs will be obtained with different tools (perhaps even different vendors) over the lifetime of a well. These internal effects are examined using a database of measurements made in the same zone of a single test well. The database was generated from several dozen tools; each calibrated in the same fixture. Using this database, corrective schemes were devised that minimize internal effects, thereby producing measurements that are more consistent from unit to unit. The corrective schemes are parameterized in the calibration process for each tool and applied to all log data run with that particular tool." @default.
- W2001055679 created "2016-06-24" @default.
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- W2001055679 date "2003-09-09" @default.
- W2001055679 modified "2023-10-18" @default.
- W2001055679 title "Internal Environmental Corrections for a New Carbon Oxygen Logging System" @default.
- W2001055679 doi "https://doi.org/10.2118/80558-ms" @default.
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